Vibratory current converter



Aug 12, 1958 R. RITTER 2,847,542

VIBRATORY CURRENT CONVERTER Filed Jan. 22, 1957 INVENTOR ROLF' RITTER Y kuamm;

United States Patent O vIBRATonY `CUrnRENr convnnrnn Rolf Ritter, Heilbronn-Sontheim, Germany, assigner to Firma Kupfer-AsbestCo. Gustav Bach, Heilbronn- Sontllem, Germany Application `Ianuary 22, 1957, Serial No. 635,265!

Claims priority, application Germany January 2S, 1956 2 Claims. (Cl. 20D- 166) This invention relates to electrical converters, and more particularly to vibratory current converters and especially the so-called vibratory choppers designed to transform direct current into alternating current.

Devices of this kind require the counter-springs to rest on the `counter-supports under a certain bias stress. For purposes of .a symmetric and uniform performance of the choppers it is further important that the spring bias is exactly the same on both sides of the contact.

Vibratory current converters have been proposed where the bias stress of the counter-springs derives from a bending, at an appropriate angle, of the counter-supports. From the point where the counter-spring is clamped on the counter-support, the counter-spring is forced against the `counter-support whereby the necessary bias is obtained. In this case, the contact position is oblique. Instead of bending the counter-supports, the bias can also be obtained by bending the lower parts of the counter-springs. All arrangements of the above-noted kind are accompanied by the disadvantage that the required exactitude and precision of the bias is obtained only with great difficulty. These arrangements require bending tools and operations, and moreover, render it mandatory that the precise observation `of the bending angle determined to give the desired result, is kept under constant surveyance.

It is an object of the present invention to provide a vibratory chopper free from the above disadvantages, and requiring no additional tools or procedures while .assuring precise -assembly and operation of the device.

Other objects, and the manner in which the same are attained, will become apparent as this specification proceeds.

The invention contemplates a vibratory chopper providing between the counter-support and the correlated contact spring, an intermediate disk which rests on the straight counter-support and imparts, depending on its thickness, a corresponding bias to the spring, which is displaced without a bend. The length of the spring can be precisely adjusted, in the course of the assembly of the chopper, by means of adjusting pins which are engaged by corresponding apertures. ln an alternative embodiment, the counter-support and counter-spring may be mutually connected in their lower portions, for example by riveting. By -a suitable selection of the thickness of the intermediate disk, the spring bias can be varied according to requirements without any necessity to have recourse to special tools. The distances between contacts can be varied without inliuencing the elastic Patented Aug. 12, 1958 ICC characteristics of the counter spring by effecting any bending that may be necessary, below the rivet or other point of interconnection iof the spring and the support.

In the drawing accompanying this specification and forming part thereof, one embodiment of the invention is shown diagrammatically by way of example.

In the drawing:

Fig. l is a full view of the entire assembly,

Fig. 2 is a section drawn to a larger scale of a contact and spring assembly, and

Fig. 3 is a front View `of the portion of the device shown in Fig. 2.

Referring now to the drawing, wherein like elements are denoted by identical reference numerals, the vibratory system is seen to comprise, in a welleknown manner, the vibratory spring 1 associated with an armature 2, driving stator 3 and driving contact 4, and the oscillating contacts 5. The countercontacts 6 are mounted, for example by riveting, on the counter-springs 8, but in `accordance with the invention, disks 7 which may be circular but also may have any other desired configuration, are interposed between the contacts 6 and the counter-springs 8 which disks extend beyond the confines of the contacts 6 so as to space the counter-springs 8 from their supports 9, the extent of this spacing, or the distance by which the spring 8 is removed from the support 9 at the very top thereof, being determined by the thickness of the disk 7, the variation of which thus permits to vary said distance and consequently vary the bias imparted to the spring according to requirements.

The support 9 extends along a straight line, without a bend; the counter-spring 8 also is not provided with any bend, but is solely slightly bent resiliently away from the support by virtue of the interposition of the disk 7.

The bottom portions of the spring 8 and the support 9 are provided with apertures 10 which are juxtaposed on .assembly of the device so they can be engaged by an adjusting pin. If desired, the spring and support may also be firmly connected at this point by a rivet 11 passing through the aperture 10. The distance between the contacts can be varied without iniiuencing the resilient characteristics of the counter-spring, by bending the spring below the point where it is mounted, e. g. below the rivet 11 shown in the drawing.

I wish it to be understood that I do not desire to be limited to the exact details of construction, design and operation shown .and described as various modifications within the scope of the following claims, which do not depart from the spirit of the invention nor involve any sacrifice of the advantages thereof, will be |obvious to workers in this field.

I claim:

l. A vibratory chopper of the biased contact spring type, comprising a contact spring, a support associated therewith, and an intermediate disk interposed between said spring and the top of said support, whereby to impart the required bias to the spring in the absence of bends in the spring and in the support.

2. The device according to claim l, comprising means for irmly connecting the bottom portions of the spring and the support.

No references cited. 

